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Apparatus for recording and reproducing digital information signals of different transmission rates

US 6,441,979 B1 · Assignee: Hitachi, Ltd. · Inventors: Amada; Nobutaka et al.

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Why it's free to use

  • Filed March 16, 1995 and granted August 27, 2002. A patent filed before June 8, 1995 lasts 17 years from grant or 20 from filing, whichever is longer, so its term ended August 27, 2019.
  • Any extension is capped at five years, so it can't still be in force.
  • We haven't checked its US family, and a later related patent could still be in force. We check US rights only.
FiledMarch 16, 1995
GrantedAugust 27, 2002
Term endedAugust 27, 2019
Application number08/405288
Classification (CPC)G11B20/10527 +2 more
Length24 pages

Timeline

Timeline From USPTO dates

19961999200220052008201120142017Application filedMarch 16, 1995Patent grantedAug 27, 2002Term endedAug 27, 2019

Sources & verification

Official USPTO records

Full published documentText and every drawing sheet as a PDF.USPTOFile historyStatus, office actions, notices, fee records and petitions.USPTO Patent CenterPatent Public Search recordSearchable full text and bibliographic data.USPTO

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